My cats love this tree.  I bought it back when I picked up an all black kitten from the pound.  She was all over it.  About 8 weeks later I picked up an all white male kitten from the pound thinking my black kitten needed a buddy.  (Wrong, but another story).  However, The two of them play on this so much that I have had to replace two of the tubes.  They run up and down it.  It is sturdy and the cats just love it.  I have had this now about two years or longer.  I have recommended this site to others as it was reasonable and free shipping.  Especially when you look at the prices and the little things in a store.   I am also considering purchasing a second because my cats love it so much.